#!/usr/bin/env sh

if [ "$#" -lt 1 ]; then
    cat <<EOF

Usage: $0 TARGET

Create a single-file bundle from the nixpkgs attribute "TARGET".

For example:

$ $0 emacs
$ ./emacs

EOF

    exit 1
fi

target="$1"

expr="with import <nixpkgs> {}; with import ./appimage-top.nix {}; appimage (appdir { name = \"$target\"; target = $target; })"

out=$(nix-store --no-gc-warning -r $(nix-instantiate --no-gc-warning -E "$expr"))

if [ -z "$out" ]; then
  echo "$0 failed. Exiting."
  exit 1
else
  appimage=$out/*.AppImage
  cp -f $appimage .
  echo "AppImage created at $(basename $appimage)"
fi